Benchmarking HTTP/2 servers with h2load - an Apache Bench & Siege equivalent
Web performance enthusiasts have been running load simulations with simple tools such as Apache Bench and Siege for years now. Hell, AB is based on Zeus from 1996. These tools allow you to simulate HTTP traffic using multiple parameters such as concurrency, length of time, number of requests made, etc.
For modern protocols you need modern tools. To get started with testing your HTTP/2 server I recommend installing h2load:
h2load is benchmarking tool for HTTP/2. If built with spdylay library, it also supports SPDY protocol. It supports SSL/TLS and clear text for both HTTP/2 and SPDY.
More information available online from the nghttp2 site: https://nghttp2.org/documentation/h2load-howto.html
There are also more complex tools available, but for many cases these simple load generating tools are good enough for rough performance testing.